Double Digit Addition and Subtraction Workbook: 100 Days of Practice Pages Would you much-needed maths practice book for Addition and Subtraction problems? This book is a good example, there is plenty of practice exercises. This book focuses on helping students adding and subtracting multi-digit numbers up to 4 digits. Your kid will be enthusiastic about doing these 100 days of practice pages. You can use this book every day, it's like a family competition, there are many questions on one page. Your children will challenge themself to do each page faster and not make any mistakes. Each page of this workbook has questions, a score, and a time box. If your children don't make any mistakes you can give them something as a reward. This workbook contains lots of math worksheets with 2000+ practice problems. Included in this book: Adding and Subtracting 2-digit numbers mentally; Adding and Subtracting 3-digit numbers with 1-digit numbers, whole tens, and whole hundreds; Adding and Subtracting 3-digit numbers in columns; Adding and Subtracting Big numbers; Addition and Subtraction Puzzles and Challenges (secret trails, place value...); Answers for all pages are at the end of the book.